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On average, symptoms from E. coli O157:H7 infection develop within 3 to 4 days of eating contaminated food, with a range of 1 to 10 days. Symptoms usually include severe bloody diarrhea and abdominal cramps; sometimes the infection causes non-bloody diarrhea or no symptoms.
The generation time for E. coli in the laboratory is 15-20 minutes, but in the intestinal tract, the coliform's generation time is estimated to be 12-24 hours. For most known bacteria that can be cultured, generation times range from about 15 minutes to 1 hour.